Introduction to Java

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JAVA

    James Gosling Invented Java in 1991 and it is developed by Sun Microsystems. But the first version was released in 1995. The current version of Java is Java 17. 



Java is an Object Oriented Programming language and it is platform-independent (Write once and run anywhere).  Java is easy to compile, and debug and it provides reusability of code that makes development faster.

 The following four are important to run, compile and debug the Java application 
  •  JDK - Java Development Kit 
  •  JRE - Java Runtime Environment
  •  JVM - Java Virtual Machine
  •  Compiler - Java Compiler. 

 JDK

        It is used to provide tools to develop Java applications it comes with Compiler, JRE, and JVM. 



COMPILER
  •  Java is the compiler used for compilation. 
  • The compiler will check the program syntax and if it is wrong then throw the error at compile time. 
  •  If we don't have an error in our program it will create the bytecode file. 

 JRE

    It is used to provide the environment for executing the byte code with the help of JVM 

 JVM 
  •  Java Virtual Machine will execute the bytecode inside the JRE.
  •  JVM is platform dependent.




Original name of the Java program was initially Oak.

 




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